Bug - password field of battle.net login - keys out of control

If i try to login in battle.net and enter something into the password field, the keys suddenly affect the vivaldi-navigation. E.g. if i am typing in numbers, vivaldi will switch the tab-windows. If i had visited a previous page "e.g. foo.de" and then enter battle.net-login with the same tab-window and using the "backspace"-key, vivaldi is going back to the previous webpage (foo.de). thats the battle.net login: https://eu.battle.net/login/en/index?ref=http://eu.battle.net/en/&app=com-root The bug doesnt appear with windows-vivaldi, as far as i can see it. my system: vivaldi: - 1.0.98.2 "/etc/issue": (its "Lubuntu") - Ubuntu 14.04.1 LTS linux: - 3.13.0-45-generic x11-server: - 7.7+1ubuntu8 wm: - LXDE 0.5.0-4ubuntu4 ( Also, i cant use the tab-key in the message field of vivaldi forum )